Bob,
I think I got it. Imported your backbrace stl into tinkercad and used the grid there to get it to the mm.
Left to right is 196mm and the "middle" hole is 42mm from left.??
Let me know if you come up with something else.
73
Mark
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AJ6CU/7
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu
